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Romaniceras) Marigniacum Sp. Nov. Ammonite Biohorizon (Middle Turonian

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Romaniceras) Marigniacum Sp. Nov. Ammonite Biohorizon (Middle Turonian Identification of a Romaniceras (Romaniceras) marigniacum sp. nov. ammonite biohorizon (Middle Turonian) at the base of the Tuffeau Jaune de Touraine (France) Francis Amédro, Francis Robaszynski, Hervé Châtelier, Patrice Ferchaud, Bertrand Matrion To cite this version: Francis Amédro, Francis Robaszynski, Hervé Châtelier, Patrice Ferchaud, Bertrand Matrion. Identi- fication of a Romaniceras (Romaniceras) marigniacum sp. nov. ammonite biohorizon (Middle Turo- nian) at the base of the Tuffeau Jaune de Touraine (France). Carnets Geol, 2020, 20 (4), pp.37-89. 10.4267/2042/70720. hal-02546817 HAL Id: hal-02546817 https://hal.archives-ouvertes.fr/hal-02546817 Submitted on 18 Apr 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Carnets Geol. 20 (4) E-ISSN 1634-0744 DOI 10.4267/2042/70720 Identification d'un biohorizon d'ammonites à Romaniceras (Romaniceras) marigniacum sp. nov. (Turonien moyen) à la base du Tuffeau Jaune de Touraine (France) Francis AMÉDRO 1, 2 Francis ROBASZYNSKI 3 Hervé CHÂTELIER 4 Patrice FERCHAUD 5 Bertrand MATRION 1, 6 Résumé : Dans le sud du Bassin de Paris, le long des vallées de la Loire et du Cher, le Tuffeau Jaune de Touraine a été traditionnellement daté du Turonien supérieur par la présence de très rares Romani- ceras deverianum (ORBIGNY, 1841). Toutefois, les quelques mètres de tempestites à la base de la for- mation n'ont jamais livré d'ammonites. Aujourd'hui, juste au sud du Turonien stratotypique, en Tourai- ne méridionale, la récolte de plus de 150 ammonites à la base du Tuffeau Jaune de Touraine ainsi que dans le sommet du Tuffeau de Bourré sous-jacent apporte des précisions significatives sur l'âge des formations. En réalité, les premiers mètres du Tuffeau Jaune de Touraine appartiennent encore à la zo- ne à Romaniceras ornatissimum (Tm 3) datant le Turonien moyen. La découverte dans cet intervalle de Romaniceras (Yubariceras) ornatissimum (STOLICZKA, 1864) associé à la nouvelle espèce Romanice- ras (R.) marigniacum AMÉDRO & CHÂTELIER sp. nov. indique qu'on se trouve dans la partie élevée de la zone à R. ornatissimum. D'autres espèces sont présentes dans ce biohorizon : outre Romaniceras (R.) marigniacum et Romaniceras (Yubariceras) ornatissimum, on trouve Masiaposites cf. kennedyi AMÉDRO & DEVALQUE, 2014, Collignoniceras woollgari regulare (HAAS, 1946), C. turoniense (SORNAY, 1951) et Collignoniceras vigennum AMÉDRO & CHÂTELIER sp. nov. Le sommet du Tuffeau de Bourré a quant à lui livré une cinquantaine d'ammonites avec une associa- tion légèrement différente de celle connue dans la localité type de Bourré-Montrichard dans la vallée du Cher. Le matériel récolté près de la confluence Vienne-Creuse comprend : Lewesiceras peramplum (MANTELL, 1822), Romaniceras (Y.) ornatissimum (STOLICZKA, 1864), Collignoniceras woollgari regulare (HAAS, 1946), C. canthus (ORBIGNY, 1856) et C. turoniense (SORNAY, 1951). L'espèce Collignoniceras papale (ORBIGNY, 1841), qui représente un tiers des récoltes à Bourré, est apparemment absente, tan- dis que trois nouvelles espèces du même genre sont identifiées : C. hourqueigi AMÉDRO & CHÂTELIER sp. nov., C. badilleti AMÉDRO & CHÂTELIER sp. nov. et Collignoniceras sp. A. Mots-clefs : • Bassin de Paris ; • Tuffeau de Bourré ; • Tuffeau Jaune de Touraine ; • ammonites ; • Turonien moyen ; • zone à Romaniceras (R.) ornatissimum ; • biohorizon à R. (R.) marigniacum 1 Université de Bourgogne - Franche-Comté, UMR 6282, CNRS Biogéosciences, 6 boulevard Gabriel, 21000 Dijon (France) 2 26 rue de Nottingham, 62100 Calais (France) ; [email protected] 3 57 rue Desmortiers, 17100 Saintes et Université de Mons, Faculté Polytechnique, Département Mines-Géologie, 9 rue de Houdain, B. 7000 Mons (Belgique) [email protected] 4 La rue neuve, 35830 Betton (France) [email protected] 5 41 rue des Genêts, 86280 Saint-Benoît (France) [email protected] 6 1 ter rue du Pont, 10450 Bréviandes (France) ; [email protected] Manuscrit en ligne depuis le 22 février 2020 [Éditeur : Bruno GRANIER ; éditeur pour la langue anglaise : Stephen EAGAR] 37 Carnets Geol. 20 (4) Citation: AMÉDRO F., ROBASZYNSKI F., CHÂTELIER H., FERCHAUD P. & MATRION B. (2020).- Identification d'un biohorizon d'ammonites à Romaniceras (Romaniceras) marigniacum sp. nov. (Turonien moyen) à la base du Tuffeau Jaune de Touraine (France).- Carnets Geol. , Madrid, vol. 20, nº 4, p. 37-89. Abstract: Identification of a Romaniceras (Romaniceras) marigniacum sp. nov. ammonite biohorizon (Middle Turonian) at the base of the Tuffeau Jaune de Touraine (France). - In the south of the Paris Basin, along the Loire and Cher valleys, the Tuffeau Jaune de Touraine Formation was traditionally attributed to the Late Turonian by the presence of rare Romaniceras deverianum (OR- BIGNY , 1841) . Moreover, the several metres of tempestites at the base of the formation never yielded ammonites. Today, in southern Touraine, more than 150 ammonites were collected from the base of the Tuffeau Jaune de Touraine and in the highest part of the underlying Tuffeau de Bourré bring new significant data: the lower part of the Tuffeau Jaune de Touraine remain in the Romaniceras ornatissi- mum zone, Middle Turonian in age (Tm 3). Furthermore, the discovery in that biohorizon of the new species Romaniceras (R.) marigniacum AMÉDRO & CHÂTELIER sp. nov. is indicative of the highest part of the R. ornatissimum zone (high Tm3). Other species are associated to the R. marigniacum biohorizon as: Romaniceras (Yubariceras) ornatissimum (STOLICZKA , 1864), Masiaposites cf. kennedyi AMÉDRO & DEVALQUE , 2014, Collignoniceras woollgari regulare (HAAS , 1946), C. turoniense (SORNAY , 1951) and Collignoniceras vigennum AMÉDRO & CHÂTELIER sp. nov. With regard to the top of the Tuffeau de Bourré Formation, it yielded about fifty specimens of ammo- nites but the assemblage is different to that found in the type locality of Bourré-Montrichard in the Cher valley. The material collected near the Vienne and Creuse junction includes : Lewesiceras peram- plum (MANTELL , 1822), Romaniceras (Y.) ornatissimum (STOLICZKA , 1864), Collignoniceras woollgari re- gulare (HAAS , 1946), C. canthus (ORBIGNY , 1856) and C. turoniense (SORNAY , 1951). The spe- cies Collignoniceras papale (ORBIGNY , 1841), which represents one third of the Bourré collection is ap- parently absent whereas three new species belonging to the same genus are identified as : C. hour- queigi AMÉDRO & CHÂTELIER sp. nov., C. badilleti AMÉDRO & CHÂTELIER sp. nov. and Collignoniceras sp. A. Key-words: • Paris Basin; • Turonian Stratotype; • Tuffeau de Bourré; • Tuffeau Jaune de Touraine; • ammonites; • Middle Turonian; • Romaniceras (R.) ornatissimum zone; • R. (R.) marigniacum sp. nov. biohorizon 1. Introduction (F.A.) actuellement reconnues dans le Turonien de l'Eu- rope. Son examen montre que les craies du bas- À la différence des étages Albien et Cénoma- sin anglo-parisien apportent des informations si- nien où les ammonites abondent dans tous les gnificatives pour la limite Cénomanien-Turonien faciès et le plus souvent à travers toute la suc- et le Turonien inférieur, les tuffeaux du Saumu- cession lithologique, aucune coupe européenne rois et de la Touraine pour les trois premières zo- ne permet d'effectuer des récoltes d'ammonites nes du Turonien moyen, qui en compte quatre, en continu depuis la base jusqu'au sommet de les grès du Massif d'Uchaux pour la quatrième zo- l'étage Turonien, que ce soit en France, en Angle- ne du Turonien moyen et le Turonien supérieur, terre, en Allemagne ou ailleurs. Seuls certains in- et enfin les calcaires crayeux de Westphalie pour tervalles renferment du matériel de manière le sommet du Turonien supérieur et la limite avec significative. C'est la raison pour laquelle la le Coniacien. Dans le Turonien moyen, en raison zonation d'ammonites en usage actuellement d'un provincialisme marqué des faunes, les zones dans le Turonien de l'Europe est la synthèse d'ob- successives à Kamerunoceras puis à Romaniceras servations et de récoltes multiples réalisées dans (ammonites à caractère téthysien) sont surtout des aires de sédimentation et des faciès très va- usitées autour du Bassin méditerranéen, dans le riés : dans les craies et les tuffeaux du Bassin an- Bassin aquitain et dans les tuffeaux déposés le glo-parisien (GROSSOUVRE , 1889, 1901 ; LECOINTRE , long de la bordure méridionale du Bassin anglo- 1947, 1960 ; C.W. WRIGHT , 1957 ; HANCOCK et al. , parisien, en particulier dans le Saumurois et en 1977 ; C.W. WRIGHT & KENNEDY , 1981 ; AMÉDRO & Touraine, tandis que le même intervalle est re- BADILLET , 1978, 1982 ; AMÉDRO et al. , 1983 ; KEN - groupé sous le terme de zone à Collignoniceras NEDY et al. , 1983), dans les grès du Massif woollgari (taxon à caractère boréal comme tous d'Uchaux dans la Vallée du Rhône (AMÉDRO & DE- les Collignoniceratinae) dans les craies du Bassin VALQUE , 2014), dans les calcaires crayeux du Bas- anglo-parisien et du nord de l'Europe. Dans le Tu- sin de Münster en Westphalie au NW de l'Allema- ronien supérieur, la zone à Prionocyclus germari , gne (KAPLAN , 1988 ; KAPLAN & KENNEDY , 1996) et connue depuis trois décennies dans le nord-ouest enfin dans les calcaires à silex et les grès du Bas- de l'Allemagne (KAPLAN, 1988), n'a été identifiée sin vocontien au sud-est de la France (DIEBOLD et que très récemment en France dans le Bassin vo- al. , 2018 ; BAUDOUIN et al. , 2018). La Figure 1 dé- contien (DIEBOLD et al. , 2018). veloppe la succession des 10 zones d'ammonites 38 Carnets Geol. 20 (4) Figure 1 : Les zones d'ammonites turoniennes utilisées en Europe. Les zones indiquées en caractères gras sont re- connues dans le stratotype. Les intervalles coloriés en jaune livrent de nombreuses ammonites et permettent la con- struction d'une zonation.
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